When I invoke e-mail verification in the Opt-in module it fails when a recipient submits their e-mail address on the opt-in form. The following error message occurs.

"Failed to send validation email to the user, please contact site administrator".

We're using DNN 7.1.2 and Bulk Email version 6.07.44 on our site. Note: When we de-select email verification the email submit form works fine. Also, we request only their e-mail address on the form. Nothing else.

Actually, it doesn't work with the verification switch off either. I presumed it did, since it says "subscription successful", but when I go in to check for the recipients name in the list, it is not there.